KR20190043098A - Turbocharger heat shield - Google Patents

Abstract

A heat shield (200) for a turbocharger (100) has a disc-type structure. The heat shield (200) includes an outer radial portion, an outer wall (210, 210′, 210′′), a connecting wall (212, 212′, 212′′), and an inner wall (214, 214′, 214′′). The outer radial portion is arranged circumferentially around an axis of the heat shield (200). The outer wall (210, 210′, 210′′) is extended from the outer radial portion in a first axial direction. The connecting wall (212, 212′, 212′′) is extended radially inwards substantially perpendicularly from the outer wall (210, 210′, 210′′). The inner wall (214, 214′, 214′′) is extended substantially perpendicularly from the connecting wall (212, 212′, 212′′) in a second axial direction opposite to the first axial direction.

Description

Turbocharger Heat Shield {TURBOCHARGER HEAT SHIELD}

The present invention relates to a turbocharger, and more particularly to a turbocharger having a heat shield.

The turbocharger is a forced induction device used to increase the pressure of the intake air supplied to the internal combustion engine. Exhaust gas from the engine is sent to the turbocharger to drive the turbine wheel. The torque generated by the turbine wheel drives the compressor wheel, which pressurizes the intake air to feed the engine. The engine can have an increased power output relative to other similar natural intake engines by pressurizing the intake.

The turbine wheel and the compressor wheel may be connected by a shaft rotatably supported within a bearing housing disposed therebetween. High temperatures associated with an increase in exhaust gas can increase the temperature of the lubricating or cooling feature associated with the bearing housing and / or the bearing housing. As the temperature associated with the bearing housing increases, lubrication or cooling features may become inefficient, components of the bearing housing may become damaged or inefficient, and other components associated with the turbocharger may be damaged or inefficient Or a combination of these may occur.

To limit heat transfer from the exhaust gas to the bearing housing, a heat shield may be disposed between the turbine wheel and the bearing housing. The heat shield is mainly composed of a plate or disk structure capable of thermal growth in the radial direction. When radially restrained, the heat shield can be deflected in the axial direction. This axial deflection of the heat shield can result in undesirable consequences, such as creating too small a clearance on the turbine wheel, which can result in undesired aerodynamic conditions, such as collision with the turbine wheel or even friction losses or undesirable sealing pressure gradients ≪ / RTI >

Aspects, features, elements, embodiments and embodiments of a turbocharger with a heat shield are disclosed herein.

In one embodiment, the heat shield for a turbocharger has a disk-like structure. The heat shield includes an outer radial portion, an outer wall, a connecting wall and an inner wall. The outer radial portion is disposed circumferentially around the axis of the heat shield. The outer wall extends from the outer radial portion in the first axial direction. The connecting wall extends radially inward substantially perpendicular from the outer wall. The inner wall extends substantially perpendicularly from the connecting wall in a second axial direction opposite to the first axial direction.

In another embodiment, the heat shield is disposed in the turbocharger between its turbine housing and the bearing housing. The heat shield includes a first radial portion, a second radial portion and a radially biased portion. The second radial portion is disposed radially inward of the first radial portion. The radially biased portion extends radially from the first radial portion to the second radial portion. The radially deflecting portion includes an outer wall extending substantially parallel to the axis of the heat shield from the first radial portion, a connecting wall extending radially inwardly from the outer wall, and a second wall extending substantially parallel to the axis of the second radial portion from the connecting wall And has an inner wall extending so as to take a U-shape.

In another embodiment, the turbocharger assembly includes a turbine housing, a turbine wheel, a bearing housing, a shaft, and a heat shield. The turbine wheel is disposed within the turbine housing. The shaft is coupled to the turbine wheel and extends into the bearing housing. The heat shield is disposed between the turbine housing and the bearing housing. The heat shield includes an outer radial portion, an inner radial portion, an outer wall, an inner wall, and a connecting wall. The outer wall extends substantially parallel to the shaft from the outer radial portion. The connecting wall extends radially inward from the outer wall. The inner wall extends substantially parallel to the shaft from the connecting wall to the inner radial portion.

The present disclosure is best understood from the following detailed description when read in conjunction with the accompanying drawings. It is emphasized that, in accordance with conventional practice, the various features of the drawings are not drawn to scale. Conversely, the dimensions of the various features are arbitrarily enlarged or reduced for clarity.
1 schematically shows a partial cross-sectional perspective view of a turbocharger in accordance with the principles of the present invention.
Figure 2 schematically shows a partial cross-sectional view of a turbocharger with a heat shield in accordance with the principles of the present invention.
Figure 3a is a perspective view of the heat shield of the turbocharger shown in Figure 2;
3B is a cross-sectional view of the heat shield shown in FIG. 3A.
Figure 4 schematically illustrates the heat shield shown generally in Figures 3a and 3b under thermal stress, in accordance with the principles of the present invention.
Figure 5 schematically shows a partial cross-sectional view of a turbocharger with a heat shield in accordance with the principles of the present invention.
Figure 6 schematically illustrates a perspective view of another heat shield in accordance with the principles of the present invention.

An embodiment of a thermal shield geometry is disclosed herein that controls the growth and position of a heat shield under thermal stress (e.g., expansion).

1 shows a turbocharger 100 which is an exhaust gas driven forced induction device used in connection with an internal combustion engine (not shown). The turbocharger (100) includes a turbine wheel (110) located within a turbine housing (120). The turbine housing 120 includes an exhaust gas inlet 122 for receiving exhaust gas from an internal combustion engine. Exhaust gas is sent from the exhaust gas inlet 122 to the turbine wheel 110 before leaving the turbine housing 120 at the exhaust gas outlet 123. For example, the exhaust gas may flow from the exhaust gas inlet 122 to the turbine wheel 110 tangentially and / or radially through the swirling portion formed by the turbine housing 120, and thereafter the exhaust gas outlet 123 In the axial direction.

The turbocharger 100 includes a compressor wheel 140 located within the compressor housing 150. The compressor housing 150 includes an intake inlet 152 and an intake outlet (not shown). The intake air is delivered from the intake inlet 152 to the compressor wheel 140, where the intake air is pressurized by the rotation of the compressor wheel 140. Thereafter, the intake air exits the compressor housing 150 at the intake air outlet before being supplied to the internal combustion engine.

The rotation of the compressor wheel 140 is driven by the rotation of the turbine wheel 110. In particular, the turbine wheel 110 and the compressor wheel 140 are connected to the shaft 160, respectively. The shaft 160 may be a substantially rigid member and each of the turbine wheel 110 and the compressor wheel 140 may be coupled to the shaft 160 to prevent rotation of the turbine wheel 110 and the compressor wheel 140 relative to the shaft 160. [ 160, respectively. As a result, the compressor wheel 140 can rotate integrally with the turbine wheel 110 in response to rotation of the turbine wheel 110.

The shaft 160 is supported within the bearing housing 170 so that the shaft 160 can freely rotate at a high rotational speed relative to the bearing housing 170. [ The bearing housing 170, the turbine housing 120, and the compressor housing 150 are all disposed along the axis of rotation of the shaft 160. More specifically, the bearing housing 170 is disposed between the turbine housing 120 and the compressor housing 150, wherein the first end of the bearing housing 170 is connected to the turbine housing 120 and the first end of the bearing housing 170 The two ends are connected to the compressor housing 150. The bearing housing 170 may include lubrication and / or cooling features.

The bearing housing 170 defines a cavity including the shaft 160 and the thrust bearing 190. The cavity may be closed by an oil seal plate 180 (e.g., cover, closure, etc.). The shaft 160, the thrust bearing 190 and the oil seal plate 180 have the function of cooperatively transmitting axial forces (e.g., axial loads) from the turbine wheel 110 to the bearing housing 170 Thus positioning the shaft 160 axially with respect to the bearing housing 170.

A wastegate valve 124 may be mounted within the turbine housing 120 to allow exhaust gas to bypass the turbine wheel 110. For example, the wastegate valve 124 is adapted to switch the exhaust gas from the turbine wheel 110. The switching of the exhaust gas can be used to control the turbine speed and subsequently to control the rotational speed of the compressor wheel 140. By controlling the rotational speed of the compressor wheel 140, the wastegate valve 124 can regulate the maximum ambient air pressure of the turbocharger 100. In some embodiments, the wastegate control assembly is adapted to open and close the wastegate valve 124. The wastegate control assembly opens the wastegate valve 124 when the exhaust gas pressure is high and closes the wastegate valve 124 when the exhaust gas pressure falls. For example, the waste gate control assembly includes an actuator 130. Actuator 130 may include an electrical actuator, a mechanical actuator, a pneumatic actuator, a hydraulic actuator, or other suitable actuator. The actuator 130 is adapted to move the wastegate valve 124 between an open position when the exhaust gas pressure is high and a closed position when the exhaust gas pressure is low.

In some embodiments, a heat shield, such as heat shield 200 schematically illustrated in Figures 2, 3a, and 3b, may be disposed between turbine wheel 110 and bearing housing 170. The heat shield 200 is adapted to deflect heat away from the exhaust gas away from the bearing housing 170 to control the temperature associated with the bearing housing 170.

The heat shield 200 may include a geometric shape that provides thermal growth control and position control of the heat shield 200 with the heat shield 200 under thermal stress. The heat shield 200 may comprise steel, aluminum or other suitable material, and may include a disc-shaped or substantially disc-shaped profile or structure. For example, the heat shield 200 can be stamped and / or a single structure (e.g., a component).

The heat shield 200 includes a first radial portion 202, a radial deflecting portion 208 and a second radial portion 216, And extends circumferentially around (e.g., around shaft 160). The first radial portion 202 extends radially inward starting from the peripheral edge (e.g., the outer periphery or the circumference) of the heat shield 200. The radially deflecting portion 208 extends radially inward from the inner periphery of the first radial portion 202 to the outer periphery of the second radial portion 216. Radial deflection portion 208 may also be referred to as a bellows (e.g., a circumferential bellows), an intermediate radial portion, or a radially compressed portion or feature element. The second radial portion 216 extends radially inwardly from the radially deflectable portion 208 of the heat shield 200 to an inner edge that is substantially perpendicular to the central bore 220 For example, an opening).

As will be described in greater detail below, the radially deflecting portion 208 is deflected radially (e.g., compressed, deformed, or curved) so that the first radial portion 202 from the thermal stress and the second (E. G., Radial expansion or radial growth) between the radial portions 216. < / RTI > Thus, the radial deflecting portion 208 limits the axial deflection of the heat shield 200 and the resulting problems, otherwise it will not be possible to handle the problem (e.g., Interference with the turbine wheel 110) may occur. The first radial portion 202 and / or the second radial portion 216 may also be deflected axially in a manner that is at least partially controlled (e.g., limited) by the provision of the radially deflecting portion 208. [ . As discussed below, variations of the heat shield 200 may include a plurality of radially compressed feature elements.

The first radial portion 202 is configured to be secured to the turbocharger 100. When secured to the turbocharger 100, the heat shield 200 can be constrained radially at its peripheral edge. For example, the first radial portion 202 may be axially compressed between the turbine housing 120 and the bearing housing 170. In particular, the first radial portion 202 may include an outer sub-portion 204 that is substantially planar and extends in a plane A perpendicular to the axis of the shaft 160. The outer sub-portion 204 of the first radial portion 202 may also be referred to as an attachment portion, a clamping portion, or a planar portion.

Other portions of the first radial portion 202 of the heat shield 200 may be configured to be deflected axially relative to the turbine housing 120 and / or the bearing housing 170. For example, the first radial portion 202 includes an inner sub-portion 206 extending radially inwardly from the outer sub-portion 204 of the heat shield 200 to the radially deflectable portion 208 . The turbine housing 120 and the bearing housing 170 are axially spaced to define a gap 228 in which the inner sub-portion 206 is disposed. The gap 228 has an axial dimension that is greater than the inner sub-portion 206 (e.g., the turbine housing 120 and the bearing housing 170 form an inner sub-portion 206 of the heat shield 200) Spaced apart by a distance greater than the thickness of the substrate. The gap 228 is sized such that the first radial portion 202 of the heat shield 200 is axially spaced in the axial direction (e.g., in the turbine housing 120 or in the bearing housing 200) (Until it comes into contact with the substrate 170). The gap 228 also allows the inner sub-portion 206 to translate radially, rather than limiting radial growth. When the heat shield 200 is not under thermal stress, the inner sub-portion 206 is located in the turbine housing (not shown) (e.g., by not contacting turbine housing 120, bearing housing 170 or both housings) 120 and the bearing housing 170. As shown in Fig. A variation of the heat shield 200 may omit the inner sub-portion 206 of the first radial portion 202 of the heat shield 200 so that the radial deflecting portion 208 may be omitted from the first Extends directly from the radial portion 202 (see the heat shield 200 " of Figure 6, discussed below).

The inner sub-portion 206 may have a generally convex profile (e.g., cross-sectional shape or curvature). For example, when radially inwardly moved, the inner sub-portion 206 may project axially away from the bearing housing 170 and toward the turbine housing 120. The turbine housing 120 and / or the bearing housing 170 have a corresponding profile to form a gap 228 to receive the inner sub-portion 206 in the gap and provide axial deflection of the inner sub- And / or radial movement. This arrangement of the convex profile of the first radial portion 202 (e.g., the inner sub-portion 206 thereof) of the heat shield 200 may be combined with the thermal growth of the heat shield 200 (Away from the bearing housing 170) to cause axial deflection towards the turbine housing 120. This axial deflection may thus be limited by the inner sub-portion 206 engaging the turbine housing 120. [ The inner sub-portion 206 of the first radial portion 202 is greater than that of the radial deflecting portion 208 and has a radial dimension (e.g., a radius) that is greater than, for example, two times greater.

The first radial portion 202, its outer sub-portion 204, and / or the inner sub-portion 206 may also include a major portion (e.g., an outer major portion) or a minor portion (e.g., May be referred to as the elongated portion in the radial direction (for example, to extend radially farther than, for example, in the axial direction) by extending in the radial direction by 2 times, 3 times, 4 times, .

As described above, the radially deflecting portion 208 of the heat shield 200 extends radially between the first radial portion 202 and the second radial portion 216. The radially deflecting portion 208 is configured to deflect radially (e.g., compress, bend or otherwise deform) radially (e.g., in a bellows-like manner) in response to thermal stresses acting on the heat shield 200 To be folded into itself). The radial deflecting portion 208 is configured as a U-shaped protrusion that defines or defines a gap radially and circumferentially extending about the axis between the first radial portion 202 and the second radial portion 216 . This gap allows relative radial movement between the first radial portion 202 and the second radial portion 216. [ For example, the radially constrained first radial portion 202 at the outer periphery may be inflated radially inward while the second radial portion 216 may be inflated radially outward. In some embodiments, the inner portion of the radially deflecting portion 208 is adapted to be deflected radially between 0.4 millimeters and 0.6 millimeters, and the outer portion of the radially deflecting portion 208 has a radius of between 0.5 millimeters and 0.7 millimeters Lt; / RTI >

When the heat shield 200 is assembled to the turbocharger 100, the radially deflecting portion 208 is positioned axially between the turbine wheel 110 and the bearing housing 170 and also within the radius of the turbine housing 120 Direction. For example, the radial deflecting portion 208 may be disposed radially inward of the inner radial end of the swirl portion wall of the turbine housing 120 defining the swirl portion. The radially deflecting portion 208 may, for example, protrude axially from the bearing housing 170 to the second plane B. The heat shield 200 may have an overall axial length that extends, for example, between the first plane A and the second plane B, for example. Other aspects of radially deflecting portion 208, including U-shaped protrusions, are described in further detail below.

The second radial portion 216 extends radially inward from the radially deflectable portion 208 of the heat shield 200 to the inner periphery which forms the central bore 220 of the heat shield 200 . The second radial portion 216 is axially disposed between the turbine wheel 110 and the bearing housing 170 when the heat shield 200 is assembled to the turbocharger 100. [ The second radial portion 216 may extend in a third plane C in which the central bore 220 is disposed. For example, as shown, the second radial portion 216 extends axially from the radially biasing portion 208 toward the bearing housing 170 to be recessed relative to the turbine wheel 110, 3 plane (C). The third plane C may be parallel or substantially parallel to the second plane B and axially between the second plane B and the first plane A. The second radial portion 216 may be adapted to be deflected axially when the heat shield 200 is under thermal stress. For example, by having a concave configuration with respect to the turbine wheel 110, the second radial portion 216 may be deflected away from the turbine wheel 110 toward the bearing housing 170 as it is radially expanded under thermal stress, . In some embodiments, the second radial portion 216 is adapted to be deflected axially between 0.35 millimeters and 0.75 millimeters. The second radial portion 216 may extend from the radially deflectable portion 208 at an angle that is perpendicular or substantially perpendicular thereto (e.g., 90 +/- 5, 10, or 15 degrees) have. The second radial portion 216 has a radial dimension (e.g., radius) that is greater than, for example, two times the radial dimension of the radially deflectable portion 208. The second radial portion 216 may be referred to as a major portion of the heat shield 200, such as an inner major portion or a radially elongated portion.

As noted above, the radially deflecting portion 208 of the heat shield 200 is deflected (e. G., Deformed, bent, compressed, etc.) radially so that the first radial portion 202 and the second radius < (E.g., from thermal growth) of the directional portion 216. In one embodiment, For example, the radial deflecting portion 208 is generally U-shaped in cross-section and has an outer wall 210, an inner wall 214, and a connecting wall 212 extending radially between the outer wall 210 and the inner wall 214 ). When the heat shield 200 is under thermal stress, the outer wall 210 and / or the inner wall 214 are deflected toward each other to cause radial growth of the heat shield 200 (e.g., Relative radial movement between the first radial portion 202 and the second radial portion 216).

The outer wall 210 extends from the inner periphery of the first radial portion 202 to the outer periphery of the connecting wall 212. In some embodiments, as shown in the cross-sectional views of Figures 2 and 3b, the outer wall 210 extends axially from a fourth plane (not shown) transited from the first radial portion 202 of the outer wall 210 do. For example, the outer wall 210 may extend substantially parallel to the axis (e. G., Parallel to the axis, or parallel to the axis that travels toward the turbine housing 120, such as within 5, 10, As shown in FIG. The outer wall 210 may also be substantially perpendicular to or substantially perpendicular to the first radial portion 202 (e.g., relative to the outer sub-portion 204 or 90 degrees +/- 90 from the inner sub- 5, 10 or 15 degrees), or any other suitable angle. The outer wall 210 may extend axially in a linear or curvilinear cross-section. The axial direction may be determined by, for example, two axially opposed (e.g., radial, radial) radially outer surfaces of the outer wall 210 between any curved transitions (e.g., fillets) between the first radial portion 202 and the connecting wall 212 Between points or in any other suitable manner. The outer wall 210 extends circumferentially about the axis of the shaft 160 and defines an outer dimension of the radially deflecting portion 208. In some embodiments, the outer wall 210 may be closer to the outer sub-portion 204 or further away from the outer sub-portion 204 than is schematically shown in FIG. 3A. For example, as discussed in greater detail below with respect to the heat shield 200 '' of FIG. 6, the inner sub-portion 206 may be omitted, and thus the radial deflecting portion 208 ' Extends directly from the first radial portion 204 " of the generally planar heat shield 200 ".

The connecting wall 212 extends circumferentially about the axis and radially inward from the outer wall 210 to the inner wall 214. [ In some embodiments, the connecting wall 212 may be vertical or substantially vertical (e.g., within 5, 10, or 15 degrees vertical) and / or vertical or substantially vertical 10, or 15 degrees perpendicular to the outer sub-portion 204, the inner sub-portion 204, or the inner sub-portion 206) or at another suitable angle from the outer wall 210 radially inward. The connecting wall 212 may extend in a second plane B parallel to the first plane A. It should be noted that the connecting wall 212 may extend radially in a straight or curved shape in cross section. The eccentric direction is defined by two radially opposed points on the outer surface of the connecting wall 212 between any curved transition (e. G., Radius or fillet) having outer wall 210 and inner wall 214 ≪ / RTI > or by any other suitable method.

The radially deflecting portion 208 may be slightly concave in the axial direction relative to the axial surface of the vortex wall, shown in Figure 2, thereby creating an axial offset 230 therebetween (e.g., ). That is, the connecting wall 212 (and / or the second plane B) may be axially concave relative to the axial surface of the vortex wall. 5, another heat shield 200 ', which is a variation of the heat shield 200, includes a radially biased portion 208' that is flush with the axial surface of the vortex wall, .

The inner wall 214 extends axially circumferentially about the axis and axially from the inner periphery of the connecting wall 212 of the heat shield 200 to the outer periphery of the second radial portion 216. The inner wall 214 terminates in a fourth plane (not shown), for example, a second radial portion 216 transits from the inner wall 214, which is parallel to the second plane B and the fourth plane And may be parallel between these planes. The inner wall 214 may have an axial dimension (e.g., length) that is different (e.g., smaller) than the axial dimension of the outer wall 210.

(E.g., a gap is formed between the inner wall 214 and the outer wall 210), the inner wall 214 extends from the connecting wall 212, which is substantially opposite to the direction in which the outer wall 210 extends to the connecting wall 212 . The gap between the inner wall 214 and the outer wall 210 may have substantially the same radial dimension or may be moved away from the connecting wall 212 (e.g., toward the turbine housing 170) to increase the radial dimension . For example, the inner wall 214 may extend substantially parallel to the axis, such as in the negative 5, 10 or 15 degrees of the axis. The inner wall 214 may also extend in an axial direction that is perpendicular or substantially perpendicular (e.g., 90 degrees +/- 15 degrees) to the connecting wall 212, or at another suitable angle. The inner wall 214 may extend linearly or curvilinearly in the cross-section in the cross-section. The axial direction may be defined by the radius of curvature of the inner wall 214 between any curved transitions (e.g., fillets) between, for example, the connecting wall 212 and the second radial portion 216 Between two radially opposed points on the outer surface (toward the substrate 110) or in any other suitable manner.

In some embodiments, the radially deflecting portion 208 has an inner profile 218 defined by an outer surface of the outer wall 210, a connecting wall 212, and an inner surface of the inner wall 214. The inner profile 218 may be a circular or substantially circular profile (e.g., defining a call), a square or a substantially square profile (e.g., a profile having a right angle or a substantially right angle corner) . ≪ / RTI > The inner profile 218 of the radially deflecting portion 208 is configured such that the radially deflecting portion 208 is deflected (e.g., expanded, contracted, deformed, or combinations thereof) when the heat shield 200 is under thermal stress (E.g., cutouts or openings) to allow for the presence of the gaps.

4, when the heat shield 200 is under thermal stress, the inner periphery of the first radial portion 202 of the heat shield 200, the outer periphery of the second radial portion 216 The perimeter or both peripheries may move toward each other (e.g., radially inwardly and / or radially outwardly). As a result, the radially deflecting portion 208 is deflected, e.g., the outer wall 210 is tilted radially outward relative to the first radial portion 202 (e.g., to reduce the angle between them As shown in Fig. The connecting wall 212 may also be deflected in response to thermal stress, for example, its outer periphery moves radially outward relative to the inner periphery of the first radial portion 202 of the heat shield 200 . For example, the upper portion 222 of the outer wall 210 translates or moves outward toward the first radial portion 202 of the heat shield 200. The lower portion 224 of the outer wall 210 may be deflected as the upper portion 222 translates or moves toward the first radial portion 202 so that the lower portion 224 of the outer wall 210 has a first radius Away from the directional portion 202 and translate or move toward the axis. The inner wall 214 may also be deflected, for example as the outer perimeter of the second radial portion 216 moves outwardly. Radial deflecting portion 208, including outer wall 210, connecting wall 212 and inner wall 214, when heat shield 200 is no longer under thermal stress, is shown schematically in Figures 3A and 3B It is possible to return to the original shape, profile or structure as shown.

As described above, the heat shield 200 'is a deformation of the heat shield 200. The heat shield 200 'includes an outer radial portion, a radial deflecting portion 208', and a second radial portion 216 '. The radially deflecting portion 208'is constructed similar to the radially deflecting portion 208 by including an outer wall 210 ', a connecting wall 212' and an inner wall 214 '. The outer wall 210'can include a larger axial dimension than the outer wall 210 so that the connecting wall 212'is less than the connecting wall 212 of the radially deflecting portion 208 to the turbine housing 120 Are placed closer together. That is, the connecting wall 212 may be concave relative to the axial surface of the vortex wall of the turbine housing 120, while the connecting wall 212 'may be coplanar with it (e.g., Lt; RTI ID = 0.0 > directional). ≪ / RTI >

Figure 6 schematically illustrates a perspective view of the heat shield 200 ". As described above, a variation of the heat shield 200 may be applied to the connecting portion and / or major portion of the heat shield, For example, the heat shield 200 ' includes two radially biased portions, one of which is very close to the attachment portion < RTI ID = 0.0 > The heat shield 200 " extends radially inwardly from its outer perimeter to its inner perimeter, as shown, which has a central bore (e. G. 220). As it moves radially inward from the outer periphery, the heat shield 200 '' includes a first radial portion 204 '', a first radial deflecting portion 208 '', a second radial portion 232, A second radial deflecting portion 234 and a third radial portion 236. [

The first radial portion 204 " is configured to be secured to the turbocharger (e.g., compressed between the turbine housing 120 and the bearing housing 170). The first radial portion 204 '' may be configured, for example, similar to the outer sub-portion 204 of the first radial portion 202 of the heat shield 200. The first radial portion 204 " may also be referred to as an outer radial portion or an attachment portion.

A first radial deflecting portion 208 ", which may be referred to as a radially outwardly deflecting portion, extends radially inward from the first radial portion 204 " to the second radial portion 232. The first radial deflecting portion 208 " is configured to be similar to the radially deflecting portion 208 of the heat shield 200 such that the first radial portion 204 '') And a second radial portion 232, which, when under thermal stress, may allow the outer perimeter to move radially outward (e.g., grow or expand) radially. The first radial deflecting portion 208 " defines a radial gap between the first radial portion 204 " and the second radial portion 232 of the heat shield 200. For example, the first radial deflecting portion 208 " may have a U-shaped structure having an outer wall 210 ", a connecting wall 212 ", and an inner wall 214 ".

The outer wall 210 ", the connecting wall 212 " and the inner wall 214 " of the first radial deflecting portion 208 " are formed in a manner similar to the radial deflecting portion 208 previously described, The radial portion 204 ", the second radial portion 232, the axis, and one another. The outer wall 210 " may be disposed parallel or substantially parallel to the axis and / or perpendicular or substantially perpendicular to the first radial portion 204 ". The outer wall 210 " may have an axial length that is greater than the axial length of the inner wall 214 ". The connecting wall 212 " may extend radially inwardly from the outer wall 210 " to the inner wall 214 ". The connecting wall 212 " The inner wall 214 "extends axially from the inner periphery of the connecting wall 212" to the second radial portion 232. The inner wall 214 "is parallel to the axis Or substantially parallel to and / or perpendicular to or substantially perpendicular to the connecting wall 212 " and / or the second radial portion 232. The heat shield 200 " When assembled, as described with respect to the radially deflecting portion 208 of the heat shield 200 and the radially deflecting portion 208 'of the heat shield 200', the first radial deflecting portion 208 'May protrude from the bearing housing 170 and may be concave or flush with the axial surface of the vortex wall of the turbine housing 120 The first radial deflecting portion 208 '' may also be axially disposed between the turbine wheel 110 and the bearing housing 170. A further understanding of the second radial deflecting portion 234 , The description of the radially deflecting portion 208 is referred to.

The second radial portion 232 extends circumferentially about the axis and radially from the first radial deflecting portion 208 " to the second radial deflecting portion 234. The second radial portion 232 may include an inner radial portion (e.g., for the second radial deflecting portion 234) (e.g., for the first radial deflecting portion 208 ' An outer radial portion, an outer major portion, or a radially elongated portion. The second radial portion 232 is greater than the radial dimension of the first radial deflecting portion 208 " and / or the second radial deflecting portion 234 and may be greater than, e. G., Greater than, The second radial portion 232 is axially disposed between the turbine wheel 110 and the bearing housing 170 when the heat shield 200 "is assembled to the turbocharger do.

The second radial deflecting portion 234 extends from the second radial portion 232 to the third radial portion 236. The second radially deflecting portion 234 may be referred to as a radially inner deflecting portion. The second radial deflecting portion 234 is configured to be similar to the first radial deflecting portion 208 " to allow the inner periphery to move radially inward (e.g., grow or expand) when under thermal stress And a second radial portion 236 that can move (e.g., grow or expand) radially outwardly when the outer periphery is under thermal stress. can do. The second radial deflecting portion 234 defines a radial gap between the second radial portion 232 and the third radial portion 236. For example, the second radial deflecting portion 234 may have a U-shaped structure with an outer wall, a connecting wall, and an inner wall (not shown), which are spaced apart from the outer wall 210 "of the first radial deflecting portion 208". The second radial deflecting portion 234 is configured to have a different angle and / or dimension than the first radial deflecting portion 208 " When the heat shield 200 '' is assembled to the turbocharger, the second radial deflecting portion 234 is located on the outer circumference of the turbine wheel 110 And the bearing housing 170. In order to better understand the second radial deflecting portion 234, the radial deflecting portion 208 and / or the first radial deflecting portion 208 " See the description.

The third radial portion 236 extends radially inward from the second radial biasing portion 234 to the central bore 220. [ The third radial portion 236 may be referred to as an inner major portion or a radially elongated portion. The third radial portion 236 is greater than the radial dimension of the first radial deflecting portion 208 " and / or the second radial deflecting portion 234 and may be greater than, for example, a radial dimension (e.g., For example, a radius). The third radial portion 236 is axially disposed between the turbine wheel 110 and the bearing housing 170 when the heat shield 200 '' is assembled to the turbocharger.

The term " or " as used herein is intended to mean " exclusive " or " That is, unless otherwise stated or contextually clear, it is intended to indicate either the natural inclusive substitution " X comprises A or B ". That is, X comprises A; X comprises B; Or if X comprises both A and B, then " X comprises A or B " is satisfied in accordance with any of the examples set forth above. Also, the articles "a" and "an" as used in this specification and the appended claims should be construed to mean "one or more" in general, unless the context clearly dictates otherwise or in the singular .

Also, for purposes of simplicity of explanation, the drawings and description herein may include an order or series of steps or steps, but elements of the methods disclosed herein may occur in various orders or concurrently. In addition, elements of the methods disclosed herein may occur with other elements not explicitly set forth and described herein. In addition, not all elements of the method described herein may be required to implement the method according to the present invention. Although aspects, features, and elements are described herein in specific combinations, each aspect, feature, or element may be used independently or in various combinations with or without other aspects, features, and elements.

While this disclosure has been described in connection with specific embodiments thereof, it is to be understood that the disclosure is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims. The scope of which is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as are law permitted.

Claims (15)

A heat shield (200) for a turbocharger (100), the heat shield (200) having a disc-shaped structure comprising:
An outer radial portion disposed circumferentially about an axis of the heat shield 200;
An outer wall (210, 210 ', 210 ") extending from the outer radial portion in a first axial direction;
Connecting walls (212, 212 ', 212 ") extending radially inward substantially perpendicularly from the outer walls (210, 210', 210"); And
An inner wall (214, 214 ', 214 ") extending in a second axial direction substantially opposite to the first axial direction substantially perpendicularly from the connecting wall (212, 212', 212"). The method of claim 1, wherein the outer walls (210, 210 ', 210 ") extend from a first plane (A) to a second plane (B) starting in a first axial direction, 214 ") extends in a second axial direction and terminates in a first plane (A) and a second plane (B) and a third plane (C) parallel between them. The heat shield (200) of claim 2, wherein the outer walls (210, 210 ', 210 ") start at the first plane (A) and terminate at the second plane (B). The heat shield (200) of claim 3, wherein the connecting wall (212, 212 ', 212 ") extends radially inwardly in the second plane (B). The heat shield (200) of claim 1, wherein the outer wall (210, 210 ', 210 ") and the inner wall (214, 214', 214") have different axial dimensions. The method of claim 1, wherein the outer walls 210, 210 ', 210 ", the connecting walls 212, 212', 212" and the inner walls 214, 214 ', 214 " And forming an intermediate radial portion extending radially between the radial portions. 7. A heat shield (200) as recited in claim 6, wherein said intermediate radial portion is adapted to fit into a recess formed between inner radial ends of a vortex wall of a turbine housing (120) of said turbocharger (100) . 7. The apparatus of claim 6, wherein the intermediate radial portion is adapted to deflect corresponding to a relative radial movement between an inner periphery of the outer radial portion and an outer periphery of the inner radial portion, A heat shield (200) caused by thermal stress of the heat shield (200). The heat shield (200) of claim 8, wherein the outer wall (210, 210 ', 210 ") is adapted to bend radially outwardly with respect to the outer radial portion. 9. The method of claim 8, wherein the relative radial movement comprises moving the inner perimeter of the outer radial portion and the outer perimeter of the inner radial portion radially closer to one another. . A heat shield (200) disposed within a turbocharger (100) between a turbine housing (12) of a turbocharger and a bearing housing (170)
A first radial portion (202, 204 ");
A second radial portion 216, 216 ', 232 located radially inward of the first radial portion 202, 204 "
Includes a radially deflecting portion (208, 208 ', 208 ") extending radially from the first radial portion (202, 204") to the second radial portion (216, 216', 232) The radially deflecting portions 208,208'and 208'2 are formed by outer walls 210 and 210 'extending substantially parallel to the axis of the heat shield 200 from the first radial portions 202 and 204' (212, 212 ', 212 ") extending radially inwardly from the outer wall (210, 210', 210") and the connecting wall 2, having an inner wall (214, 214 ', 214 ") extending substantially parallel to the axis of the first radial portion (216, 216', 232) The system of claim 11, wherein the second radial portion (216, 216 ', 232) has a radial dimension that is at least two times greater than the radial deflecting portion (208, 208' ). 13. The method of claim 12, wherein the radially deflecting portions (208,208 ', 208 ") are positioned between the first radial portion (202,204 " Is configured to deflect into relative radial movement between the directional portions (216, 216 ', 232). 12. The method of claim 11, further comprising another radial deflecting portion (208, 208 ', 208 ") and a third radial deflecting portion, 2 radially inward from the radial portion 216, 216 ', 232 and the third radial portion 236 extends radially inwardly from the other radial deflecting portion 208, 208', 208 " And the other radial deflecting portion 208, 208 ', 208 "extends from the second radial portion 216, 216', 232 substantially parallel to the axis of the heat shield 200 212 ', 212 "extending radially inwardly from the other outer wall 210, 210', 210" and the other connecting wall 212, 212 ', 212 " (214, 214 ', 214 ") extending radially inwardly substantially parallel to the axis of the third radial portion (236) from the first radial portion (212', 212" A heat shield (200), which is U-shaped. The method of claim 14, wherein the third radial portion (236) has a radial dimension that is at least two times greater than the other radial deflecting portion (208, 208 ', 208 " 208, 208 ', 208 ') is defined by the relative radial movement between the second radial portion 216, 216 ', 232 and the third radial portion 236 from the thermal stress of the heat shield 200 A heat shield (200) configured to deflect.

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